Radius: 6/(2*pi) = 0.9549296586
Surface area: 4*pi*0.95492965862 = 11.4591559 or as 11.459 square cm to three decimal places
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The circumference of a circle with a diameter of 6cm is about 18.85cm
The circumference of a circle = 2*pi*radius or diameter*pi
Volume = 216 cm3Surface area = 216 cm2
90 cm3
Circumference = 2 pi R = 12 pi = 37.7 cm(rounded)